Device and method capable of measuring liquid-liquid diffusion coefficient at different temperatures

A diffusion coefficient and width technology, which is applied in the field of devices and methods that can measure liquid-liquid diffusion coefficients at different temperatures, can solve the problems of failure to consider Raman laser heating disturbance, inability to realize diffusion coefficient measurement, and low measurement accuracy. Achieve the effect of eliminating laser thermal effect, realizing continuous measurement and high measurement efficiency

Active Publication Date: 2010-05-05
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the method and device have the following problems: it is limited to normal temperature, and the measurement of diffusion coefficient at different temperatures cannot be realized; the disturbance of the measurement result by Raman laser heating cannot be considered, and the measurement accuracy is low

Method used

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  • Device and method capable of measuring liquid-liquid diffusion coefficient at different temperatures
  • Device and method capable of measuring liquid-liquid diffusion coefficient at different temperatures
  • Device and method capable of measuring liquid-liquid diffusion coefficient at different temperatures

Examples

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Effect test

Embodiment 1

[0055] Embodiment 1: the diffusion coefficient measurement (method of the present invention) of toluene and hexanaphthene

[0056] Silicon-based microfluidic chip, first obtained by deep silicon etching with such figure 2 The silicon substrate with the pattern shown in the figure is then left with a 200nm-thick aluminum film at the bottom of the flow channel by using the negative glue process, and finally bonded with the glass anode. Stick the chip on the surface of the soaking copper block. The cross-sectional size of the main diffusion straight channel is 800 μm wide and 30 μm deep.

[0057] Toluene-cyclohexane solutions with mole fractions of toluene of 0.247 and 0.447 were prepared, and the solutions of the two concentrations were respectively injected at 10 μL min by syringe pump. -1 Inject the two entrances of the chip, select the section at a distance of 1cm downstream of the intersection point as the measurement section, and take 30μm as the transverse scanning inter...

Embodiment 2

[0064] Example 2: Measurements with a silicon-glass chip with an aluminum thin film

[0065] The silicon-glass chip with aluminum thin film is the chip used in Example 1. The chip is glued to the surface of the soaking copper block. The cross-sectional size of the main diffusion straight channel is 800 μm wide and 30 μm deep.

[0066] Prepare toluene-cyclohexane solutions with mole fractions of toluene of 0.609 and 0.811, respectively. -1 The two entrances of the injection chip were injected, and the section at a distance of 1 cm downstream of the intersection point was selected as the measurement section, and the horizontal scanning interval was 30 μm. The Raman spectrum was scanned seven times at each position, and the data was the average value of the seven concentration measurements. The Raman spectrum uses a 514.5nm argon ion laser with a power of 25mW and a single sampling scan time of 10s. For the data obtained after fitting, see Figure 8 , the deviation from the r...

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Abstract

The invention relates to a device and method capable of measuring liquid-liquid diffusion coefficient at different temperatures. In the invention, solution in different concentrations is injected into a micro fluid control chip 2 by inject pumps 1 and 5, concentration distribution of mixing runner in the micro fluid control chip 2 is measured by a Raman spectroscopy, and further liquid-liquid diffusion coefficient is inverted. The micro fluid control chip is placed on a soaking block 4, and the soaking block is connected with a metering pump 7 and a thermostatic waterbath 8, so as to realize measurement at different temperatures. The micro fluid control chip 2 realizes high-accuracy measurement by design of winding micro runner structure before mixing, mixing runner section designed as a rectangle with high crown proportion and aluminizing at the bottom of runner. The device and method of the invention can realize continuous measurement of liquid-liquid diffusion coefficient at different temperatures and has the advantages of less sample usage, low cost, non contact, high sensibility, high repeatability, high efficiency, small error, safety and reliability and easy operation.

Description

technical field [0001] The invention relates to a device and method capable of measuring liquid-liquid diffusion coefficients at different temperatures, in particular to a device and method capable of measuring liquid-liquid diffusion coefficients at different temperatures based on Raman spectroscopy and a microfluidic chip. Background technique [0002] Liquid phase diffusion plays a very important role in the study of mass transfer process, calculation of mass transfer rate, and chemical design and development. Diffusion coefficient is the key to unit operation and reaction design. The measurement and theoretical description of liquid-liquid mass transfer and diffusion are far more difficult than those of gases and solids. At present, the liquid phase diffusion coefficient is mainly obtained by experimental measurement, mainly including diaphragm cell method (pseudo-steady state), real-time laser holographic interferometry (unsteady state), and Talyor dispersion (pulse att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
Inventor 于新海林莹涂善东王正东何乃昺
Owner EAST CHINA UNIV OF SCI & TECH
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